Improve swiping to reveal gear for ongoing notifications with time check

Swiping to show the gear for ongoing notifications can be difficult, this
CL adds an additional check for the duration of the gesture, if the
gesture takes long enough on an non dismissable notification then it
considers it a gear reveal.

Bug: 30908400
Change-Id: Iec769bae2a70ef79acb43c69063cc9e2b6b1f56f